mill ward



.No Model W. FOSTER 8v W. H. MILLWARD.

STEAM AOTUATBD VALVE. 100.433.200. Patented July 29,1890.

UNITED STATES PATENT OFFICE.

WILLIAM FOSTER AND IILLIAM II. MILLW'ARD, OF BROOKLYN, NET YORK; SAID MILLVARD ASSIGNOR TO SAID FOSTER.

STEAM -ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 483,200, dated July 29, 1890.

Application filed May 20, 1890. Serial No. 352,531. (No model.)

To all whom, t may concern:

Be it known that we, WILLIAM Fos'rER and WILLIAM II. MILLWAED, both citizens of the United States, and residents of the city of Brooklyn, in the county of Kings and State of New York, have invented as joint inventors a certain newand useful Improvement in Steam-Actuated Valves, of which the following is a specification.

Our invention relates -to slide-valves for operating direct-acting steam-pumps, and is intended to be used in connection with and as an improvement upon the valve described in the specification forming part of Letters Patent granted to us on the 5th day of July, 1881, and numbered QQCSJGS, particularly when the same shall be used on vertical pumps or where greater steam-poweris required in one direction of the stroke of the pump than in the other. In vertical pumps, particularly for deep wells, the upward stroke of the pump always requires greater steam-pressure than the downward stroke, the load being much greater; and the object of ourinvention is to cut otl a portion of the steam for the downward stroke while not lessening the exhaust, and leaving the full head on for use in the upward stroke.

In the drawings, Figure 1 represents a longitudinal vertical. section of our improvement as applied to a steanrpump, showing the arrangement of the parts as described in said Letters Patent and the application of our improvement thereto. Fig. 2 shows a vertical detail section of our improvement greatly enlarged.

O is the main steam-cylinder; g, the main steam-piston. o and o are steamports- A is the slide-valve as described in said Letters Patent. P and P are the valve-pistons.

H is a connecting-web east with the pistons and connecting them together rigidly.

The piston P is reduced in size by turning down so as to slide within a sleeve R, which is loosely keyed to prevent it from rotating on the piston, but in such a manner as to allow it to move thereon longitudinally, which sleeve forms the outer portion of the piston.

r The position of the sleeve R on the piston is regulated by the adj usting-screw J, collared on each side of the sleeve R, the end of the piston being tapped to receive it. The end of the screw projects through the head of the steamchest S, and its outer end b is squared,

so that it may be turned from the outside by By turn- 6o ott the steam from the port o, which supplies the steam for the downward stroke of the main piston. The adj ustiugscrew may be turned either when the pump is in motion or at rest, and the supply of steam for the downward stroke may thus be readily regulated 7o without stopping the pump, and when properly adjusted or regulated the cap is screwed onto the steam-chest head to prevent the escape of steam.`

The operation of our invention is as follows: 7 5

Vhen the pump is in motion, the steamchest being full of steam, the steam is supplied for the downward stroke to the port o through the aperture between the valve A and the sleeve R, forming part of the valve-piston P; It it 8o is Adesired to lessen the supply of steam for the downward stroke, the cap L is unserewed t rom the steam-chest head, and the adjustingscrew .I is turned by applying a wrench or key to its squared end, thus causing the sleeve 8 5 R to slide along the piston P to a position nearer the valve A, thus closing the aperture After the supply has been thus properly adjusted the cap L should be again screwed in place, and the further escape of steam will 9o thereby be prevented.

That we claim as our invention, and desire to secure by Letters Patent, is-

l. Ina steam-actuated slide-valve for steamum )s consisting of a main valve and valvepistons, a sleeve sliding upon a part of the pistou and forming part thereof, and being fixed in position thereon by an adjustingscrew adjustable at will, substantially as shown and described.

IOO

2. The adj listing-'screw J, passing through the head of the steam-chest and having its end squared for adjusting, in combination with the valve-piston Pand the sleeve sliding longitudinally thereon and forming a part y thereon with reference to the valve being regulated by the adjusting-screw J, substantially as and 'for the purposes hereinabove described. 5. In a steam-actuated slide-valve, consisting of a main valve and valve-pistons, a piston the distance of which from the main valve may be regulated at Will in order to control the size of the orifice for the admission of steam to the main cylinder, substantially as shown and described.

Signed at the city of New York, in the county of New York and State of New York, this 17th day of May, A. D. 1890.

VILLIAM FOSTER. W WILLIAM H. MILLVARD. Witnesses:

IRA G. DANIEL, WILLIAM RocKWELL. 

